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12 papers · 1 filter
The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type Dwarfs
Ben Zuckerman, Inseok Song
Cool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Teff <~ 500K?) ha…
Color Gradients Detected in the HD 15115 Circumstellar Disk
J. H. Debes, A. J. Weinberger, I. Song
We report HST/NICMOS coronagraphic images of the HD 15115 circumstellar disk at 1.1\micron. We find a similar morphology to that seen in the visible and at H band--an edge-on disk…
Rotational quenching rate coefficients for H_2 in collisions with H_2 from 2 to 10,000 K
T. -G. Lee, N. Balakrishnan, R. C. Forrey +4
Rate coefficients for rotational transitions in H_2 induced by H_2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H_…
Report from Sessions 1 and 3, including the Local Bubble Debate
Robin L. Shelton
This report summarizes the discussions in the Session 1 and Session 3 groups which met to discuss the questions: ``What Physical Processes Drive the Multiphase Interstellar Medium…
Revising the Local Bubble Model due to Solar Wind Charge Exchange X-ray Emission
Robin L. Shelton
The hot Local Bubble surrounding the solar neighborhood has been primarily studied through observations of its soft X-ray emission. The measurements were obtained by attributing al…
The Effects of Doubly Ionized Chemistry on SH+ and S^+2 Abundances in X-ray Dominated Regions
N. P. Abel, S. R. Federman, P. C. Stancil
Recent laboratory measurements for the S^+2 + H2 reaction find a total rate coefficient significantly larger than previously used in theoretical models of X-ray dominated regions (…